Effect of Lanthanum and Cerium on Growth and Physiological Properties of Chlorella vulgaris
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Abstract:
In order to study the biological effects of La and Ce on Chlorella vulgaris, growth curve was plotted, and the biomass, contents of chlorophyll a and b, carotenoid and soluble sugar were tested. The results showed that La and Ce at 10-3~10-6 mM stimulated algae cell proliferation at early stage, and their growth promoting effect weakened as time was increased. Compared with blank control, the contents of chlorophyll a and b increased by 24.46% and 28.51%, respectively, when cultured with La at 10-3 mM while they were raised by 50.76% and 38.92%, respectively, with Ce at 10-4 mM. In addition, 10-3 mM La and Ce could increase the soluble sugar content by 13.38% or 34.88%, respectively.. In conclusion, certain amounts of La or Ce could efficiently promote the algae cell growth at early stage, shorten the lag stage, and increase the contents of chlorophyll and soluble sugar.
